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Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates by using high-protein biomass waste

A biomass waste, high-protein technology, applied in the field of phosphorus recovery, can solve the problem of poor effect of improving phosphorus release from phosphate-containing precipitated sludge, achieve phosphorus resource recovery, save treatment costs, and reduce the amount of lye Effect

Active Publication Date: 2021-11-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of this technology on increasing the amount of phosphorus released from phosphate-containing sedimentation sludge is poor, and the amount of phosphorus released by adding trisodium citrate is only 18%-25% higher than that of sludge without trisodium citrate.

Method used

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  • Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates by using high-protein biomass waste
  • Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates by using high-protein biomass waste
  • Method for recovering phosphorus from sludge rich in chemical phosphorus precipitates by using high-protein biomass waste

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Experimental program
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Effect test

Embodiment 1

[0031] Take 450mL of pure biological sludge and put it into the anaerobic fermentation tank, add 0.65g of ferric phosphate to simulate the sludge rich in chemical phosphorus precipitation, add 2.44g of silkworm chrysalis powder to the sludge (that is, add 0.81g of silkworm chrysalis powder for total chemical oxygen demand amount / g total chemical oxygen demand of sludge), oxygen was excluded to form an anaerobic environment, the fermenter was sealed, and anaerobic co-fermentation was carried out at 35°C for 7 days. At the same time, the iron phosphate-containing sludge without silkworm chrysalis powder was used as a control.

[0032] refer to Figure 2-Figure 4 , after adding silkworm chrysalis powder and ferric phosphate sludge for 7 days, the concentration of soluble orthophosphorus increased by 88% compared with that of iron phosphate sludge without adding silkworm chrysalis powder. Adding silkworm chrysalis powder and ferric phosphate-containing sludge for 7 days of co-fer...

Embodiment 2

[0035] Take 450mL of the remaining activated sludge rich in iron phosphate from a sewage treatment plant and put it into an anaerobic fermentation tank, and add 5.67g silkworm chrysalis powder to the sludge (that is, add 0.81g silkworm chrysalis powder total chemical oxygen demand / g sludge total chemical oxygen demand Oxygen content), get rid of oxygen to form anaerobic environment, airtight fermenter, anaerobic co-fermentation under the condition of 35 ℃ for 7 days. At the same time, the iron phosphate-containing sludge without silkworm chrysalis powder was used as a control.

[0036] refer to Figure 5-Figure 7 , after 7 days of co-fermentation with silkworm chrysalis powder and ferric phosphate sludge, the concentration of soluble orthophosphorus increased by 954% compared with that of ferric phosphate sludge without silkworm chrysalis powder. After 7 days of co-fermentation with silkworm chrysalis powder and iron phosphate-containing sludge, the concentration of total vol...

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Abstract

The invention discloses a method for recovering phosphorus from sludge rich in chemical phosphorus precipitates by using high-protein biomass waste, which comprises the steps of putting the sludge rich in chemical phosphorus precipitates into an anaerobic fermentation tank, adding a certain amount of high-protein biomass by-products in proportion according to the total chemical oxygen demand of the sludge, and carrying out closed fermentation for 4-7 days, thereby not only being capable of effectively improving the phosphorus release rate of the sludge rich in chemical phosphorus precipitates, but also being capable of generating volatile short-chain fatty acid and ammonia nitrogen with high concentration. After dehydration treatment, phosphorus and part of ammonia nitrogen can be recovered in the form of high-purity struvite crystals only by adding a proper amount of magnesium salt into the sludge dehydration liquid and adjusting the pH value to 7.5-9.0, and meanwhile, high-concentration volatile short-chain fatty acid in the dehydration liquid can be used as an economic carbon source for improving the nutritive salt removal efficiency of a sewage treatment plant. According to the method provided by the invention, the two solid wastes are subjected to resource utilization at the same time, and carbon, nitrogen and phosphorus resources are recovered. In addition, the dosage of chemical agents can be reduced, and the treatment cost is saved.

Description

technical field [0001] The invention belongs to the field of sludge disposal and resource treatment, and in particular relates to a method for recovering phosphorus from sludge rich in chemical phosphorus precipitation by using high-protein biomass waste. Background technique [0002] Phosphorus is one of the most important nutrients for life and plays an irreplaceable key role in plant growth and food production. The main source of phosphorus is phosphate rock, which, as a non-renewable resource, is increasingly depleted with human exploitation. On the other hand, about 3 million tons of phosphorus enter domestic sewage every year. In order to prevent eutrophication of natural water bodies, domestic sewage needs to be treated before it can be discharged. Therefore, the wastewater generated by some human activities such as domestic sewage, breeding wastewater, and fertilizer production wastewater contains a large amount of phosphorus, which is a potential phosphorus resourc...

Claims

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Application Information

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IPC IPC(8): C02F11/127C02F11/122C02F11/04C02F1/52C01B25/45C02F101/10
CPCC02F11/04C02F11/122C02F11/127C02F1/5245C01B25/451C02F2101/105C01B25/003C02F9/00C02F1/66C02F11/143
Inventor 李咏梅张志鹏平倩郭文杰
Owner TONGJI UNIV
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